如何在matplotlib中添加额外的y轴标签

import matplotlib.pyplot as plt

fig, ax1 = plt.subplots()

ax1.plot(x, y1, color='blue', label='Y1')

ax2 = ax1.twinx()

ax2.plot(x, y2, color='red', label='Y2')

ax2.set_ylabel('Y2 Label')

ax1.legend(loc='upper left')
ax2.legend(loc='upper right')

plt.show()